VerboseIsHandle returns TRUE if the specified value is a valid handle. If it is not a valid handle, then the routine displays diagnostic information about it in the Debug Transcript.
The h parameter is the value to be tested.
MacApp calls VerboseIsHandle from the global routines DisposeIfHandle and VerboseIsObject. You can use this routine to test the validity of handles in debugging versions of your application.
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Unit: UMacAppUtilities
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ROUTINE
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VerboseIsHandle
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FUNCTION VerboseIsHandle(h: UNIV Handle): BOOLEAN;